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This lichen grows on exposed, coarse-grained siliceous rock near the coast. It resembles L. auriculata (described elsewhere) but the discs have a soft, matt appearance. It bleeds C+ carmine red when a section through the disc rim (exciple) is tested in the field. It is scattered in Ireland, but nowhere plentiful.

Key characteristics

Thallus almost reduced to a stain, discs black, matt with rim C+ carmine red in section